If you count the number of electrons (small dots), you have the atomic number. In this case you have 11 so this atom is a sodium atom. Sodium has 1 valence electron (electron on the outer shell) and chlorine has 7. This means that if sodium gave one electron away and chlorine would obtain one electron, they would both have the (ideal) noble gas conformation (full outer shell).
<u>Answer:</u> The moles of oxygen and carbon dioxide in air is
and
respectively
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
![\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20moles%7D%3D%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%7BMolar%20mass%7D%7D)
Given mass of atmosphere = ![5.00\times 10^{18}kg=5.00\times 10^{21}g](https://tex.z-dn.net/?f=5.00%5Ctimes%2010%5E%7B18%7Dkg%3D5.00%5Ctimes%2010%5E%7B21%7Dg)
Average molar mass of atmosphere = 28.96 g/mol
Putting values in above equation, we get:
![\text{Moles of atmosphere}=\frac{5.00\times 10^{21}g}{28.96g/mol}=1.73\times 10^{20}mol](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20atmosphere%7D%3D%5Cfrac%7B5.00%5Ctimes%2010%5E%7B21%7Dg%7D%7B28.96g%2Fmol%7D%3D1.73%5Ctimes%2010%5E%7B20%7Dmol)
We know that:
Percent of oxygen in air = 21 %
Percent of carbon dioxide in air = 0.0415 %
Moles of oxygen in air = ![\frac{21}{100}\times 1.73\times 10^{20}=3.63\times 10^{19}mol](https://tex.z-dn.net/?f=%5Cfrac%7B21%7D%7B100%7D%5Ctimes%201.73%5Ctimes%2010%5E%7B20%7D%3D3.63%5Ctimes%2010%5E%7B19%7Dmol)
Moles of carbon dioxide in air = ![\frac{0.0415}{100}\times 1.73\times 10^{20}=7.18\times 10^{16}mol](https://tex.z-dn.net/?f=%5Cfrac%7B0.0415%7D%7B100%7D%5Ctimes%201.73%5Ctimes%2010%5E%7B20%7D%3D7.18%5Ctimes%2010%5E%7B16%7Dmol)
Hence, the moles of oxygen and carbon dioxide in air is
and
respectively
Some offspring may be tall, some may be short, and some may be medium medium sized.
Freezing, condensation, Deposition.
Answer:In regards to writing the formula, we know that magnesium has a charge of 1+ and sulfate, SO4, has a charge of 1-. Sulfate is a polyatomic ion so the charge of the whole thing is (SO4)1-. When you combine them you end up with MgSO4 and the "heptahydrate" is seven water molecules.
Explanation: